21491320

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{97}}^1\times {\mathrm{191}}^1$

素因数の和:328

約数の個数: 64

約数和(自身を含む): 50803200

約数和(自身を除く): 29311880

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 97, 116, 145, 191, 194, 232, 290, 382, 388, 485, 580, 764, 776, 955, 970, 1160, 1528, 1910, 1940, 2813, 3820, 3880, 5539, 5626, 7640, 11078, 11252, 14065, 18527, 22156, 22504, 27695, 28130, 37054, 44312, 55390, 56260, 74108, 92635, 110780, 112520, 148216, 185270, 221560, 370540, 537283, 741080, 1074566, 2149132, 2686415, 4298264, 5372830, 10745660, 21491320]

約数ペア:

[(1, 21491320), (2, 10745660), (4, 5372830), (5, 4298264), (8, 2686415), (10, 2149132), (20, 1074566), (29, 741080), (40, 537283), (58, 370540), (97, 221560), (116, 185270), (145, 148216), (191, 112520), (194, 110780), (232, 92635), (290, 74108), (382, 56260), (388, 55390), (485, 44312), (580, 37054), (764, 28130), (776, 27695), (955, 22504), (970, 22156), (1160, 18527), (1528, 14065), (1910, 11252), (1940, 11078), (2813, 7640), (3820, 5626), (3880, 5539)]